Glass cutting devices



3 Sheets-Sheet 2 June 28, 1955 E, M. TRAMMELL, sR

GLASS CUTTING DEVICES Filed Dec. 15, 1951 EARL M. TRAMMEtL, SR. 7-

Q \N w ww R June 28, 1955 E. M. TRAMMELL, SR

GLASS CUTTING DEVICES 3 Sheets-Sheet 3 Filed Dec. 13 1951 m QE 414/5777)? EARL M. TRAMMELL.$R.

United States Patent GLASS CUTTING DEVICES Earl M. Trammell, Sn, St. Louis, Mo., assignor to Huttig Sash & Door Company, St. Louis, Mo., a corporation I of Delaware Application December 13, 1951, Serial No. 261,559

10 Claims. (Cl. 49-48) This invention relates to glass cutting devices, and more particularly to an improved power driven machine for quickly, accurately and cleanly sizing fiat sheets or panes of glass.

This designer is aware of numerous earlier attempts to produce a satisfactory apparatus for the severance, as for reduction in size, of flat elements of glass or like sheet material. However, as far as is known, none of such devices is susceptible of continuous operation for any length of time without a requirement of excessive service attention, with considerable loss of time while the machine is out of service; certain of such earlier devices also exhibit serious shortcomings in an inability to effect a clean cut and break of the sheet without a substantial percentage of spoilage. Still other such earlier machines are objectionable by reason of inaccuracies in gauging the portion to be cut off, and in other ways falling far short of dependably successful performance. It is accordingly a prime objective of the present improvements to overcome each of the several prevailing operational shortcomings experienced with the earlier devices.

One more particularly stated object of the present invention, is realized in improved provisions for accurately maintaining a movable cutter element in a rectilinear path of travel during the cutting operation.

A still further and valuable feature objectively realized in the present arrangment, is found in an improved mounting of cutter element so as to facilitate the adjustment of same for different gauges or thicknesses of glass sheet to be severed, and in improved drive means for actuating a traveling cutter head which serves to transport the cutter element as same traverses the work and the work support.

Another important object is realized in an improved automatically actuated breakofi assembly to effect actual final severance of the cutoff portions of the sheet of glass or the like.

The foregoing and further objects of the invention will more clearly appear from the following detailed description of a currently preferred embodiment of a powered glass cutter, particularly when considered in connection with the accompanying drawing, in which:

Fig. 1 is a top or plan view of a working support such as a table, on which is mounted a power glass cutting device embodying present improvements;

Fig. 2 is a front elevational view of the structure of Fig. 1;

Fig. 3 is a sectional elevational view taken in a vertical plane located by line 3-3 of Fig. 2, Fig. 3 being shown on a somewhat larger scale than Figs. 1 and 2;

Fig. 4 is an enlarged fragmentary sectional view taken along line 4-4 of Fig. 2, and showing portions of the drive-chain-supporting and guiding structure, and adjacent portions of the traveling head carrying the cutter element;

Fig. 5 is a fragmentary vertical sectional view taken in a vertical plane through the cutter element, and

showing certain adjusting and supporting features, Fig. 5 being taken along line 55 of Fig. 3;

Fig. 6 is a fragmentary horizontal sectional view taken along line 66 of Fig. 5, but substantially enlarged;

Fig. 7 is an enlarged horizontal sectional view through portions of the cutter head and cutter element and is located by line 77 of Fig. 5;

Fig. 8 is a fragmentary horizontal sectional view through a lower portion of the traveling cutter head and appurtenant structure, Fig. 8 being located by line 8-8 of Fig. 5, and

Fig. 9 is a fragmentary horizontal plan view showing certain detail of the arrangement for adjusting the abutment and gauging elements used in connection with the cutter.

Referring now by characters of reference to the drawing, in Fig. 1 there is shown as providing a work supporting surface, a table generally indicated at T, the top or working level of which is indicated at 10. The table is of course suitably supported as by legs L and the requisite longitudinal and cross rails R.

Supported at one side, shown as the right side (Fig. 2) and somewhat rearwardly of the front margin of the table is an electric motor 11 or equivalent power unit built into or coupled with which is a gear head 12, extending outwardly of which is a power takeoff shaft 13 carrying a drive sprocket 14 engaged by a substantial length of endless drive element such as a roller chain 15. The end of chain 15 opposite the sprocket 14, is served by an idler sprocket 16 securd to a shaft 17, the latter being mounted in journal elements 20 of an adjustable pillow block or bearing structure generally indicated at 21. The pillow block may be anchored to the top element 10 of the table as through bolts or screws 22 extending through slots 23. The base of the pillow block structure includes a vertical flange 24 which is parallel to a fixed flange 25, the flanges being apertured to receive an adjustment bolt 26. This may if desired be in the form of a j'ackscrew directly threaded to one of the flanges whereby to provide an accurate adjustment of tension of the chain 15 upon release of the hold-down screws 22.

It will later better appear as highly desirable that the upper and lower passes of the chain 15 be constrained to a horizontal straight-line movement under all conditions. This end is assured by the provision of a chain guide structure generally indicated at 27 (Fig. 3) and which includes a base element 30A, attached as by screws to the table structure and a right angle vertical flange 31A (see Fig. 4) which may be welded or otherwise secured to a plate 32A. To the latter plate are aflixed horizontal spacers 33A and to the forward faces of the latter, slotted plates 34A are assembled as by screws 35A to the plate 32A. From this structure there results an upper chain channel 36A and a lower chain channel 37A which, in coaction with the slots in plates 34A, serve to guide each horizontal pass of the chain accurately in a straight line at all times. I

It will later better appear that the cutter wheel CW is carried by a traveling cutter head which is generally indicated at 30, and best shown in its assembly relation by Figs. 2 and 3. Traveling head 30 includes a holder for the cutter and immediate adjacent parts as indicated at 31, and which is rigidly attached to orformed as a part of a guide portion of the cutter head designated at 32. This latter comprises, as willbestappear from Fig; 4, a rear plate 33 and a front plate 34 which are kept in accurately spaced parallelism by a top adjustable bearing shoe and spacer 35, and a similaar bottom spacer 36, these parts being assembled through screws 37 and 38. There is thus formed by and between the plates and spacers just described, a bore or passage of rectangular section which conforms closely, with no more than assured working tolerances, to a stationary vertical guide plate (see Figs. 3 and 4). Through the screws 37, 38 and through a plurality of top screws 41 exists a provision for initial accurate adjustment of the clearance between the guide plate 40 and the parts embracing same.

In the rear plate 33 of the traveling cutter head 30 is formed a vertical guide groove one side of which best appears in Fig. 4 and which is indicated at 42, such groove extending vertically of the rear of the traveling cutter head and serving to receive therein a vertically movable cross head 43. The sides of this groove 43 are step-cut, as are the sides of the crosshead 43 conformably to the sides of the groove, in such maner that the crosshead is prevented from being removed from the groove, except through the ends thereof, as for assembly purposes.

The crosshead 43 carries a crankpin 44 (Fig. 4) projecting rearwardly of the head, the outer end of this pin pivotally engaging crank arm 45, the opposite end of which rotatably engages a pair of supporting plates 46 attached to the opposite sides of one of the links of the roller chain 15, the crank being free to rotate within the plates 46 for purposes hereinafter appearing.

The traveling cutter head 30 includes as before noted, a

holder for the cutter and immediate appurtenances, as indicated at 31. This may be referred to as a vertical well portion of rectangular cross section vertically slidablc within and conforming closely to which is an adjustable slide member 50 of conforming section provided with a central vertical bore 51 through the lower portion thereof, as will appear in Figs. 5, 6 and 7, the purpose of member 50 later appearing. The member 50 is retained in the well fit structure 31, as by partial front closure plates 52 attached as by assembly screws 53.

It will now appear from the relation of these parts as shown by Figs. 5, 6 and 7 that a vertical cylindrical shank element 54 is positioned in and substantially occupies the bore 51. The lower end of member 54 through a pivot pin engaging the cutter CW, constitutes an immediate holding element for the wheel. The shank 54 is slidably disposed in the bore 51 and is normally retained against rotation about its own axis through a square-section at least over part of its length, anda conforming shape of bore 51, as well as the provision of a horizontal stop arm 55 which normally rests against the uppermost end of an adjusting screw 56 threadedly engaging an extension or arm 57 (Fig. 5) on the element 50. It will now have appeared that by careful adjustment of the screws 56, the lowermost position of the shank 54 and hence of the cutter wheel.

4 shank 54, if desired, after a period of wear of the wheel CW.

Close to the lower end of the well structure 31 there is provided as will best appear from Fig. 5, a small roller 70 (see also Fig. 8), the flat face of this roller engaging an adjacent fiat lower portion of the shank 54. The roller 70 is rotatably supported by a pivot pin 71 (Fig. 8) bridging the opposite sides of the lower part of the well structure 31.

Highly useful with glass of certain types and thicknesses, is a work-engaging roller, best shown by Figs. 3 and 8 and indicated at 72. This roller is carried by a pivot screw 73 in an L shaped bracket 74 supported as a lower extension of the vertical slide structure 50 above described.

Provision is made for accurately and precisely adjusting the vertical position of the member 50 with respect to the enclosing well structure 31. This is exemplified by arm 57 attached to the member 50 (see Fig. 3), the arm being rotatively engaged by an adjusting screw 69 threadedly engaging a projection on the adjacent wall of structure 31. Thus it will appear that adjustment of screw 69 will provide for a nicety of regulation of the height of the work-pressing roller 72 above the table or the work piece G. It should be noted that slide 50 is normally free to move in the structure 31, and will usually move up and down with the wheel CW when irregularities are encountered, by coordinated regulation of screws 56 and 69, the depth of cut by wheel CW can be accurately regulated, and slight wear of the wheel may be compensated for. it should be noted that spring 64 will act against member 5%), as well as urging downwardly the element 54 carrying wheel CW.

With further reference to Fig. 8, the lower portion of the guide structure of the traveling head 30 carries a horizontal stub shaft 75, projecting rearwardly of the cutter head as a journalling support for a breaker cam roller 76,

.the purpose and function of which will be later described.

As herein described, the direction of rotation of the power shaft 13 is counterclockwise as viewed in Fig. 2, whereby the uppermost horizontal pass of the chain 15 will move to the left as viewed in Fig. 2 while the lower pass of the chain will move from left to right (Fig. 2). The present arrangement utilizes only this right hand movement of the lower pass of the chain to actuate the traveling head 30 through its working or cutting stroke,

may be accurately regulated. The shank 54 is formed with an upper shallow recess 60 into which threadedly extends a rod 61 terminating at the top in a lifting head 62. The rod 61 extends slidably through a vertically bored top spring abutment 63 which engages the upper end of a coil compression spring 64. The vertical or axial position of the abutment 63 is subject to regulation by means of an extension arm or finger piece 65 (Figs. 3 and 5), which, by lifting and partial rotation of the abutment 63, may be selectively seated in any desired one of a series of notches 66 (Figs. 3 and 6), thus enabling a variation, over a wide range, of the compressive loading imparted to the shank and wheel CW, as well as to the element 50, by the spring 64. A second adjustment is provided as above noted, through the screw 56 which will provide a variable location of lower abutment for the cutter Wheel pressure spring, and will fix as desired the lowermost position of wheel CW. It will be noted that by reason of the spacing between the closure plates 52, there is provided a ver tical slot between these plates. This enables, by manipulation of the arm 65, the cutter wheel shank and all immediately connected elements, to be lifted, as a subassembly, outwardly of the well structure 31, thus facilitating servicing or other attention to the cutter and closely related parts, and providing for easy replacement of the subassembly including the cutter wheel. together with the which thus occurs from left to right as viewed by the operator in front of the table T.

Although the functions of the parts constituting the traveling head 30 and the drive therefor, are thought to have become apparent from the description of the several elements, it may be noted for completeness that when the motor 11 is energized, the gear head 12 serving as a speed reduction agency, will operate the sprocket 14 at a considerably reduced rate of speed yet such as to effect a rate of linear movement of the chain, hence of the cutter head 30, at a rate, for example, of several feet per second. Assuming for example that the head 30 has completed a working stroke, and is now at the right hand side of the table, the crank carried by the chain 15 together with the crosshead 43, will bear a relation to other parts about as shown by Fig. 4. When, however, that link of the chain 15 which is attached to the crank arm 45 starts to travel upwardly on the outside periphery of sprocket 14, the crank arm will undergo an angular shift and in so doing will lift the cross head 43 upwardly in the guide groove 42. After the crank arm has been angularly shifted through substantially degrees, the cross head 7;, ing these parts upon completion of movement of the actuating link in the chain, downwardly about the outside of sprocket 16, whereupon the parts are again related as shown by Fig. 4. It should here be noted for completeness that, as will later better appear, the return or left hand movement of the cutter finds no resistance by reason of the work, inasmuch as at the end of the working stroke as will appear, the severed portion of the glass is removed and prior to the return stroke of the chain, the major portion on the work table will have been manually or otherwise removed from cutting position.

Just prior to beginning a subsequent working stroke of the element CW, a new sheet of glass or the like is disposed on the work table suitably gauged for cutoff by means later appearing, whereupon the cutter wheel impelled by the traveling cutter head, will engage the left hand margin of the glass G (Fig. 3) and will then be lifted very slightly, the extent of such lift being determined by the desired depth of cut and spring pressure on the wheel, and the effect of the instant vertical setting of roller 72 as determined by slide 60. Continued movement of the cutter to the right will be controlled as to depth of cut, by the setting of screw 69 and of screw 56 limiting the downward movement by the arm 55, the initial slight upward displacement of the cutter being carefully controlled by spring 64. Completion of the in right hand movement of the head on its workingstroke, is followed by severance of the cutoff edge, by means and in a manner now to be described:

The rearmost edge of the work surface of the table T, is bounded by a vertical, horizontally extending shear plate the location of which best appears in Fig. 3 as indicated at St). The uppermost margin of this shear plate constitutes a breakoff edge, and lies closely adjacent to a vertical plane coincident with the line of cutting or severance, as defined by the path of travel of the cutting wheel CW. A slight displacement of these lines is preferred by some operators. Just to the rear of the cutoff line is a breaker bar 81 which extends horizontally slightly above the plane of the work table surface 10, and is supported by a pair of pivoted arms 82. These arms are structurally the hinge pins 85 of which constitute in effect the pivots at-)- for the breakolf bar assembly. In a structure now' in usage, the pivoted arms 82 extend rearwardly of their pivots S5 and are engaged by tension springs, one connected to each of the arms 82 as indicated at 86, each such spring being secured as to a fixed pin 87 carried by a stationary portion of the frame structure.

At the right hand end as faced by the operator in Fig. 2, is a wedge shape breaker cam 90 (Figs. 2 and 3). This cam lies in the path of movement of the roller 76 heretofore referred to in connection with Fig. 8. Thus as the it roller 76, moving with the cutter head 30, engages the ramp portion of the cam 90 and thereafter the deepest portion of the cam profile, since head is prevented from upward displacement by the guide plate 40, the roller 76 coacting with cam 90 will serve to depress the breaker bar 81 to the extent of the maximum depth of the cam. As will appear, this breakoff element overlies the unwanted edge of the piece of glass G, which latter upon being sheared away from the main body of the work piece, will fall into a suitable receptacle (not shown) 'below the work table.

With reference now to the facilities for accurate predetermination of the extent of severance of the unwanted portion of the sheet G, there is provided for the initially innermost edge of the glass before cutting, a horizontal abutmentbar 91 engaged by this edge of the glass.

It will be noted from the position of the abutment bar, serving as a cutoff gauging element, that the front face of this element 91 is kept in accurate parallelism to the line of scoring or cutting followed by wheel CW as same cutoff of the work piece, the abutment member 91 is most desirably provided with adjustment features to en- "12 able a quick and accurate change in spacing of this member rearwardly of the cutting line identified with the breakoff edge and the path of travel of wheel CW.

For purposes of such adjustment the abutment bar 91 is supported by a pair of parallel arms 95, each of which is provided with an adjustment slot 96 Fig. 9 through which, in coaction with an assembly bolt 97, is provided a coarse adjustment for setting the bar 91 in exact parallelism with the breakoff edge on member and similarly in relation to the path of travel of the cutter wheel CW. The bolts 97 engage a cross member 100 of which more than one may be utilized if desired. Supported beneath the member 100 are a plurality, shown as a pair, of depending internally threaded lugs 101 (see Figs. 3 and 9). A fore-and-aft threaded bore in each of the members 101 accommodates a horizontally disposed rotatable male screw element 102, the opposite end of each of which is supported in the hearing or hanger 103 which receives a hub portion 104 of a sprocket 105, the construction of each of the bearings 103 being such as to prevent any substantial axial displacement of the threaded shaft 102 while permitting the rotation thereof through the sprocket secured to the shaft. This arrangement prevails in each of the spaced screw thread assemblies for adjusting the abutment bar 91. From each of the sprockets 195 extends a chain 106, the chains operating the paired screw thread assemblies being actuated by sprockets 107 secured as through set screws to a rotatable control shaft 110 (Fig. 3). Shaft 110 is journalled and secured against axial displacement through spaced bearing portions 111, near the front of the table, and 112 located somewhat rearwardly of the cutting and breakoff zones, the shaft 110 carrying at its forwardmost portion and adjacent the usual operators station, a hand crank 113. It will now have appeared that rotation of shaft 119 will, since sprockets 107 are of a character identical to sprockets 105, and since the two screw thread assemblies are identical, effect the actuation of the abutment bar 91 selectively toward and away from the path of the cutter wheel and the breakoff edge of member 8t according to direction of rotation of the crank 113.

To facilitate correct adjustment and placing of the abutment bar 91, the forward end portion of shaft 110 is threaded as indicated at 114 (Fig. 3). Such threaded portion operates through a horizontal index member or pointer 115 (Figs. 1 and 3). The outermost end of pointer 115 is preferably bifurcate so that its furcations straddle a stationary gauge member 116 bearing along its upper surface suitable graduations and indicia so as,

"- in coaction with the pointer, to provide a direct reading of setting of the abutment-gauge member 91, hence serving directly to indicate to the operator the extent of the work sheet to be severed.

The operation of the chain transport arrangement and the connection thereof to the traveling cutter head 30 have been heretofore generally described, as have the features for adjustment of the cutter and cutter shank and means for varying the spring loading of the cutter. There has also been heretofore pointed out the breakoff mechanism which functions sequentially to the scoring or severance stroke of the cutter.

It will now have become obvious from the description of parts that in case it is desired to remove a greater width of the sheet G, the crank 113 is actuated to rotate sprockets 107. These act through chains 106 to rotate 7 the screw shafts 102, the threads of which in 'coaction with elements 101, will retract the abutment bar 91 a distance which may be directly read on the scale carried by member 116 as indicated by pointer 115, it being noted that the shaft-carried eye portion of the latter is internally threaded and is caused to travel in a foreand-aft direction along the related part 114 of the control shaft 110. It is now obvious that reverse actuation of the crank 115 will, through the same connections, serve to bring the abutment bar 91 closer and yet in parallelism, to the severance line identified with the path of wheel CW, and similarly closer and yet parallel to the breakoff edge of element 80.

It will now have appeared that the device as described provides a dependable gauging means and squaring facility; similarly that the breakofi structure, being positively operated in timed sequence to the cutter, will result in a sharp and clean severance for breakofi action of the unwanted portion of the sheet G. It will now also have appeared that the cutter wheel CW is at all times urged against the work by a definitely controlled spring pressure through the adjustment and spring loading heretofore described, and with a positive limit carefully predetermined, of the lowest possible position of the cutter wheel CW. precision workmanship and a virtual absence of spoilage, that the traveling head is positively constrained to a straight line movement by the heavy guide plate 40. Likewise both passes of the drive chain are kept at all times in horizontal position throughout, since as will appear, the rollers of the chain have direct rolling engagement upon either or both the upper and lower plates 34 which latter define a close fitted working track for the several rollers of each given pass of the chain. Since the gauge or thickness of plates 34 corresponds approximately to the inside spacing of the side plates of the chain links, the chain is at all times guidedly constrained to a vertical plane of travel in a horizontal direction with the two passes thereof directly superposed.

By reason of these provisions and results, it will have appeared that the several objectives hereinabove expressed and others implied, are fully realized in the structure as outlined.

Although the embodiment of the invention has been described by particularized reference to its several elements and their relations, the detail of description should be understood solely in an instructive rather than in any limiting sense, numerous variants being possible within the scope of the claims hereunto appended.

I claim as my invention: 7

1. In a powered glass cutter including a support for a sheet of glass to be cut, a cutter engaging the glass and movable thereover along a straight line path, the cutter including a vertical shank portion, a spring operable against said shank portion to urge the cutter against the work piece, an element providing an upper abut ment for said spring, an extension piece projecting outwardly of said abutment, a hollow, vertical holder for the cutter, the holder being provided with a series of vertically spaced notches individually adapted to receive said extension piece, the latter coacting with the selected notch to fix the position of the upper abutment with respect to the spring and cutter, and to provide for adjustment of spring loading on the cutter, a slide member received in said holder, the slide member being provided with a bore to receive the cutter shank, a stop arm on the cutter shank, an extension on the slide member below the stop arm, a stop screw received by the extension and engaging the stop arm to enable vertical adjustment of the cutter, a hold-down element for the work, carried by the slide member, a projection on the holder, an adjusting screw received by the projection and engaging the extension on the slide member to enable vertical adjustment of the hold-down element and the cutter;

2. In a powered glass severing device including a sup- It should also be noted as making for 13 port for a sheet of glass to be cut, a cutter engaging the glass and movable thereover along a straight line path, the cutter including a vertical shank portion, a hollow, vertical holder for the cutter and shank portion, a spring operable against said shank portion to urge the cutter against the work piece, an upper abutment engaging the spring, an extension piece projecting outwardly of said abutment, the holder being provided with a series of vertically spaced notches individually adapted to receive said extension piece, the latter coacting with the selected notch to fix the position of the upper abutment with respect to the spring and cutter to provide for an adjustment of spring loading on the cutter, a stop arm carried by the shank portion of the cutter element, an extension on the holder below the said stop arm, and a stop screw received by said extension and engaging said arm and enabling a variation in limit of range of movement of the cutter in a direction toward the work.

3. In a power driven glass cutter, a work table forming a support for a sheet of glass or the like to be cut, a cutter element movable linearly across the work sheet, and provided with a vertical shank, a traveling cutter head, means for operating the cutter head and means for constraining same to rectilinear movement, the cutter head comprising a structure of substantially L shape in plan, one arm of which constitutes a vertical tubular structure forming a well, a slide member received by said well portion, the slide member being provided with a bore for the reception of the cutter shank, a spring carried by said well portion and acting upon said shank and the cutter to urge same downwardly toward the work, a screw thread adjustment for limiting the extent of downward movement of the shank and cutter, a spring abutment above the spring, an arm carried by said abutment, the well portion being provided with a plurality of slots for the selective reception of said arm whereby to enable an adjustment in abutment pressure upon the spring and therethrough, the spring loading on the cutter, a stop arm on the cutter shank, an extension on the slide member below the stop arm, a screw received by said extension and engaging said stop arm to enable cutter adjustment, a projection on the well portion, and an adjusting screw received by said projection and engaging said extension to enable variable location of the slide member.

4. In a power glass cutter, a table for the support of a sheet of glass to be sized, the table being provided with a shearing edge, a cutter member movable across the table parallel to the shearing edge, a cutter head by which the cutter member is carried, means for actuating the cutter head, a cam movable vertically, a breaker bar extended parallel to and rearwardly of the shearing edge, the cam being connected to one end portion of said breaker bar, and a cam-actuating member carried by and movable with the cutter head.

5. In a cutting device for sheet material such as glass, a table for a sheet of material in work, the table being provided with a shearing edge, a cutter member movable across the table and the work, a traveling head for supporting the cutter member, a breaker bar operable depthwise of the table and the work adjacent to said shearing edge, a cam element and a cam follower element for operating the breaker bar, one of said elements being functionally connected to the breaker bar for depthwise actuation of same, and the other said element being carried by and movable with the cutter head, said elements being located for coacting engagement following the end of a working stroke of the cutter member.

6. The combination in a power cutting device for use on frangible sheet material, of a work table, a powered cutting device operable in a line across the work table, a breakotf bar located parallel to the path of the cutting device, a roller element and a coacting cam element, one of said elements being operatively attached to the breaker bar and the other said element being carried by and movable with the cutting device, said elements adapted to be brought into engagement to operate the breakoff bar, the cam element being characterized by a ramp portion first engageable by the roller, and a plateau or dwell portion beyond the ramp portion, the cam element and roller element being located to be brought into cooperating engagement to actuate the breakoif bar following the working stroke of the cutting device.

7. The combination and arrangement of elements as recited by claim 6, but further characterized in that the cam element is disposed close to the end of the path of Working movement of the cutting device as same travels over the work, and that the roller is movable with the cutting device and acts to depress the cam and the breaker bar.

8. In a powered glass cutter, a work table constituting a support for a sheet of glass or the like to be severed, a fixed, linear shear element on the table located rearwardly of its front margin, a powered traveling cutter head and a glass cutter carried thereby, movable across the table along a linear path closely parallel to the line of said shear edge, a breakoff bar normally supported just above the plane of the table surface and above the work piece thereon, a combined breakotf gauge and abutment member characterized by a vertical face to be engaged by the innermost margin of the work piece prior to cutting, a pair of identically threaded, spaced, screw-thread assemblies operatively connected to said abutment member for the movement of same to determine the extent of severance of the sheet of material in work, said abutment member being located rearwardly of said shear edge, and arranged through said screw thread assemblies to be adjusted at all times in parallelism to the shearing edge and the path of travel of the cutting element, an actuating shaft extended rearwardly from a forward portion of the table, a pair of sprockets on said shaft, a sprocket on each of said screw thread assemblies, chains connecting the coacting sprockets for identical actuation of the screw thread assemblies by the actuating shaft, a crank on the forward portion of the actuating shaft, a fixed, direct-reading, indicia-carrying gauge member located adjacent the forwardmost por-- tion of the operating shaft, and a traveling pointer actuated by said shaft and providing with the gauge member a visual indication to the operator of the extent of th: material to be severed from the work sheet on the table.

9. In a cutting device for sheet material such as glass, a tablefor a sheet of material in work, the table being provided with a shearing edge, a cutter member movable across the table and the work, a traveling head for supporting the cutter member, a breaker bar operable depthwise of the table and the work adjacent to said shearing edge, a cam element and a cam follower element for operating the breaker bar, the cam element being functionally connected to the breaker bar for depth- Wise actuation of same, and the follower element being movable with the cutter head, said elements being located for coacting engagement following the end of a working stroke of the cutter member.

10. In a glass cutter mechanism, a work table constituting a support for a sheet of glass or the like to be severed, a linear shear edge element on the table, a traveling cutter head and a glass cutter carried thereby, move. .ie across the table along a linear path closely parallel to the line of said shear edge, a breakoff bar normally supported above the plane of the table surface and above the work piece thereon, a combined breakoff gauge and abutment member characterized by a face to be engaged by the innermost margin of the work piece prior to cutting, a pair of identically threaded, spaced, screwthread assemblies operatively connected to said abutment member for the movement of same to determine the extent of severance of the sheet of material in work, said abutment member being located rearwardly of said shear edge element, and arranged through said screw thread assemblies to be adjusted at all times in parallelism to the shearing edge and the path of travel of the cutting element, an abutment-adjusting shaft extended rearwardly from a forward portion of the table, a pair of sprockets on said shaft, a sprocket on each of said screw thread assemblies, chains connecting the coacting sprockets for identical actuation of the screw thread assemblies by the adjusting shaft, a manual actuating member on the forward portion of the adjusting shaft, and gauge and pointer means actuated by said shaft to provide a visual indication to the operator of the extent of the material to be severed from the work sheet on the table.

References (Iited in the file of this patent UNITED STATES PATENTS 635,265 Manning Oct. 17, 1899 1,522,585 Guilfoyle et al Jan. 13, 1925 1,732,148 Barrett Oct. 15, 1929 1,855,078 Williamson Apr. 19, 1932 1,987,409 Moore Jan. 8, 1935 2,051,698 Gaskell Aug. 18, 1936 2,135,072 Forester Nov. 1, 1938 2,374,281 Gheen Apr. 24, 1945 2,377,098 Owen May 29, 1945 2,504,655 Dallas Apr. 18, 1950 FOREIGN PATENTS 24,653 Germany Nov. 8, 1883 198,733 Germany May 27, 1908 

1. IN A POWERED GLASS CUTTER INCLUDING A SUPPORT FOR A SHEET OF GLASS TO BE CUT, A CUTTER ENGAGING THE GLASS AND MOVABLE THEREOVER ALONG A STRAIGHT LINE PATH, THE CUTTER INCLUDING A VERTICAL SHANK PORTION, A SPRING OPERABLE AGAINST SAID SHANK PORTION TO URGE THE CUTTER AGAINST THE WORK PIECE, AN ELEMENT PROVIDING AN UPPER ABUTMENS FOR SAID SPRING, AN EXTENSION PIECE PROJECTING OUTWARDLY OF SAID ABUTMENT, A HOLLOW, VERTICAL HOLDER FOR THE CUTTER THE HOLDER BEING PROVIDED WITH A SERIES OF VERTICALLY SPACED NOTCHES INDIVIDUALLY ADPATED TO RECEIVE SAID EXTENSION PIECE, THE LATTER COACTING WITH THE SELECTED NOTCH TO FIX THE POSITION OF THE UPPER UBUTMENT WITH RESPECT TO THE SPRING AND CUTTER, AND TO PROVIDE FOR ADJUSTMENT OF SPRING LOADING AND THE CUTTER, A SLIDE MEMBER RECEIVED IN SAID HOLDER, THE SLIDE MEMBER BEING PROVIDED WITH A BORE TO RECEIVE THE CUTTER SHANK, A STOP ARM ON THE CUTTER SHANK, AN EXTENSION ON THE SLIDE MEMBER BELOW THE STOP ARM, A STOP SCREW RECEIVED BY THE EXTENSION AND ENGAGING THE STOP ARM TO ENABLE VERTICAL ADJUSTMENT OF THE CUTTER, A HOLD-DOWN ELEMENT FOR THE WORK, CARRIED BY THE SLIDE MEMBER, A PROJECTION ON THE HOLDER, AN ADJUSTING SCREW RECEIVED BY THE PROJECTION AND ENGAGING THE EXTENSION ON THE SLIDE MEMBER TO ENABLE VERTICAL ADJUSTMENT OF THE HOLD-DOWN ELEMENT AND THE CUTTER. 